The Interaction Dynamics of a Semi-Submersible Towing a Large Towfish

Abstract

The interactions between a semi-submersible drone and its large towfl.sh, where the tension in the tow cable joining them is about 20 of the weight of the drone, are investigated. Since standard cable dynamics modelling computer programs do not model tow-vehicle/tow-body interactions, an iterative approach to calculating these interactions. is developed. Drone motions are modeled with a non-linear, six degree-of-freedom, underwater vehicle simulation incorporating pre-defined, three component, time dependent tow cable tensions applied at the tow point. Cable dynamics are modelled with the non-linear, finite segment, cable/towfish dynamic simulator DYNTOCABS, which accepts pre-defined tow-point accelerations as time varying boundary conditions. The interactions are calculated by iterating between these two programs. The method is applied to simple turning maneuvers important to mine hunting operations.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
May 29, 1998
Accession Number
AD1004971

Entities

People

  • George D. Watt
  • Mae L. Seto

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Center Of Gravity
  • Computer Programs
  • Deep Oceans
  • Detection
  • Dynamics
  • Engineering
  • Images
  • Maneuvers
  • Physical Properties
  • Sea Water
  • Simulators
  • Sonar Images
  • Submarine Engineering
  • Submersibles
  • Underwater Vehicles
  • Vehicles
  • Water

Fields of Study

  • Engineering

Readers

  • Acoustical Oceanography.
  • Computational Modeling and Simulation
  • Marine Hydrodynamics

Technology Areas

  • Autonomy